Index: lams_central/src/flash/org/lamsfoundation/lams/authoring/cv/CanvasController.as
===================================================================
diff -u -r80c77ce7a7b28f65e0c271c9c4ac57bbc1d790f7 -rad11c9f9ce2f269f164110750b2c127a6653545f
--- lams_central/src/flash/org/lamsfoundation/lams/authoring/cv/CanvasController.as	(.../CanvasController.as)	(revision 80c77ce7a7b28f65e0c271c9c4ac57bbc1d790f7)
+++ lams_central/src/flash/org/lamsfoundation/lams/authoring/cv/CanvasController.as	(.../CanvasController.as)	(revision ad11c9f9ce2f269f164110750b2c127a6653545f)
@@ -96,13 +96,20 @@
    
 	public function activityDoubleClick(ca:Object):Void{
 	   Debugger.log('activityDoubleClick CanvasActivity:'+ca.activity.activityUIID,Debugger.GEN,'activityDoubleClick','CanvasController');
-	    _canvasModel.getCanvas().stopActiveTool();
-		_canvasModel.selectedItem = ca;
-		if(ca.activity.activityTypeID == Activity.TOOL_ACTIVITY_TYPE){
-			_canvasModel.openToolActivityContent(ca.activity);
-		}else if(ca.activity.activityTypeID == Activity.GROUPING_ACTIVITY_TYPE || ca.activity.activityTypeID == Activity.SYNCH_GATE_ACTIVITY_TYPE || ca.activity.activityTypeID == Activity.SCHEDULE_GATE_ACTIVITY_TYPE || ca.activity.activityTypeID == Activity.PERMISSION_GATE_ACTIVITY_TYPE){
-			if (!_pi.isPIExpanded()){
-				_canvasModel.setPIHeight(_pi.piFullHeight());
+	    
+		_canvasModel.getCanvas().stopActiveTool();
+			
+		if(_canvasModel.getCanvas().ddm.readOnly){
+			// throw alert warning
+			LFMessage.showMessageAlert(Dictionary.getValue('cv_activity_dbclick_readonly'));
+		}else{
+			_canvasModel.selectedItem = ca;
+			if(ca.activity.activityTypeID == Activity.TOOL_ACTIVITY_TYPE){
+				_canvasModel.openToolActivityContent(ca.activity);
+			}else if(ca.activity.activityTypeID == Activity.GROUPING_ACTIVITY_TYPE || ca.activity.activityTypeID == Activity.SYNCH_GATE_ACTIVITY_TYPE || ca.activity.activityTypeID == Activity.SCHEDULE_GATE_ACTIVITY_TYPE || ca.activity.activityTypeID == Activity.PERMISSION_GATE_ACTIVITY_TYPE){
+				if (!_pi.isPIExpanded()){
+					_canvasModel.setPIHeight(_pi.piFullHeight());
+				}
 			}
 		}
     }